Most websites glossed over this, but we didn't. Silverlight, once touted as Microsoft's answer to Adobe's Flash, has been retooled from its original purpose. Microsoft is betting big on HTML5 instead, turning Silverlight into the development platform for Windows Phone, and that's it. So... Silverlight is dead - long live Silerlight?

So what you are saying is that there is absolutely no reason to do GTK+? Remember that there's not only looks, but also feel. I believe that there's a need to actually create two versions, since KDE and Gnome are very different in that regard.